Vocab

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Across
  1. 6. of mass
  2. 8. equation a description of a reaction using element symbols and chemical formulas
  3. 12. a catalyst that speeds up chemical reactions in living cells
  4. 13. reaction a chemical reaction that absorbs thermal energy
  5. 15. a chemical reaction in which a substance combines with oxygen and releases energy
  6. 17. after the chemical reaction
  7. 18. a substance that slows, or even stops, a chemical reaction
  8. 19. that states that the total mass of the reactants before a chemical reaction is the same as the total mass of the
Down
  1. 1. energy the minimum amount of energy needed to start a chemical reaction
  2. 2. reaction a process in which atoms of one or more substances rearrange to form one or more new substances
  3. 3. a substance that increases reaction rate by lowering the activation energy of a reaction
  4. 4. a type of chemical reaction in which one element replaces another element in a compound
  5. 5. a number placed in front of an element symbol or chemical formula in an equation
  6. 7. a starting substance in a chemical reaction
  7. 9. a type of chemical reaction in which two or more substances combine and form one compound
  8. 10. a type of chemical reaction in which one compound breaks down and forms two or more substances
  9. 11. a substance produced by a chemical reaction
  10. 14. a type of chemical reaction in which the negative ions in two compounds switch places, forming two new
  11. 16. reaction a chemical reaction that releases thermal energy